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Vulnerability record · CVE-2026-64357 · published 25 July 2026

CVE-2026-64357: Linux kernel vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: xfs: fix exchmaps reservation limit check xfs_exchmaps_estimate_overhead() adds the bmbt and rmapbt overhead to a local resblks variable, but the final UINT_MAX check still tests req->resblks. That is the reservation value from before the overhead was added. The computed value is stored back in req->resblks and later passed to xfs_trans_alloc(), whose block reservation argument is unsigned int. Check the computed reservation so the existing limit applies to the value that will be used.

5.5 CVSS 3.1 Medium EPSS 0.12% · top 98.3%
5.5CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
4 Sep 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: xfs: fix exchmaps reservation limit check xfs_exchmaps_estimate_overhead() adds the bmbt and rmapbt overhead to a local resblks variable, but the final UINT_MAX check still tests req->resblks. That is the reservation value from before the overhead was added. The computed value is stored back in req->resblks and later passed to xfs_trans_alloc(), whose block reservation argument is unsigned int. Check the computed reservation so the existing limit applies to the value that will be used.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0a5213bbff62b51c7d4999ac8c7e11ea57d00d45 Patch
https://git.kernel.org/stable/c/4707344b0d36d1012c8a1716e20167cd3afdd5f1 Patch
https://git.kernel.org/stable/c/a62ef2d13d6e7270dd5e88c6082bf2d0edcd5112 Patch
https://git.kernel.org/stable/c/c597c8580d50127fc1221b5a5b653a94d49e23e3 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64357), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.